NKIRAS1 / NF-kappa-B inhibitor-interacting Ras-like protein 1 · IHC design guide

Design Immunohistochemistry for NKIRAS1

Plan NKIRAS1 IHC-P around cytoplasmic staining, using appendix or colon glandular cells as positive tissue references (HPA tissue IHC). Start the IHC-validated antibody A11990 at 1 μg/mL (datasheet: A11990 IHC-P).

Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use

Immunohistochemistry protocol sheet for NKIRAS1 (IHC for NKIRAS1): expected localisation General cytoplasmic tissue staining (HPA tissue IHC), antibody A11990, validated IHC image, and IHC protocol steps — Printable **NKIRAS1** IHC protocol sheet — expected localisation General cytoplasmic tissue staining (HPA tissue IHC), antibody A11990, controls and protocol steps. Open the full NKIRAS1 IHC guide →

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NKIRAS1 Immunohistochemistry Experimental Design Guide

Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.

Must know before staining

	Expected localisation	General cytoplasmic tissue staining (HPA tissue IHC)
	Staining pattern	High glandular-cell staining, generally cytoplasmic (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6.0 HIER, 95–98 °C, 20 min (rule: cytoplasmic / membrane antigen)
	Positive control ⓘ	Appendix+4 more · see all
	Negative control ⓘ	Adipose tissue+4 more · see all

Important caveats

Reasons your staining may differ from the expected pattern.

	Fixation	Keep fixation consistent across sections. (standard IHC practice; not target-specific)
	Caveat	Staining has medium consistency with RNA expression (HPA tissue IHC)
	Regulation	Expression regulation unreported (UniProt)
	Isoform / epitope	One 1–192 chain; no isoforms annotated (UniProt)

Section 1

Recommended NKIRAS1 IHC & IF Protocols

Compare the catalog antibody’s IHC-P protocol with the published NKIRAS1 staining protocol for human renal biopsies (PMC9206042).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Tissue sections; selected-image fixative not specified (standard IHC workflow)
Fixation	Image fixative and duration unreported (datasheet A11990); verify before use.
Sectioning	4–5 µm sections on charged slides (standard)
Deparaffinisation	Xylene, graded ethanol series to water (standard)
Antigen retrieval	Heat-induced epitope retrieval in citrate buffer, pH 6.0, 20 min at 95–98 °C (standard rule: cytoplasmic / membrane antigen)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% normal serum of the secondary host, 30 min, room temperature (standard)
Primary antibody	Rabbit anti-NKIRAS1, 1 μg/mL (datasheet A11990)
Primary incubation	Overnight at 4 °C (standard)
Detection	HRP-polymer secondary, DAB chromogen 5–10 min (standard)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	NKIRAS1-positive staining in glandular cells of appendix (HPA tissue IHC: High). HPA tissue profile: General cytoplasmic expression. No signal in the no-primary control.

💡Decision noteStart with citrate pH 6.0 retrieval at 95–98 °C for 20 min (this page’s antigen-retrieval setting); the published protocol also uses citrate pH 6 (PMC9206042).

Section 2

What Is the Expected NKIRAS1 Staining Pattern?

NKIRAS1 is cytoplasmic and has no transmembrane segment (UniProt Q9NYS0: subcellular location; topology). In paraffin-section IHC, expect cytoplasmic staining in selected glandular and neuronal cells, including colon glandular cells and caudate neurons (HPA: general cytoplasmic expression; High in both). HPA rates its tissue staining Approved, with medium consistency between staining and RNA expression; interpret individual results with that limitation (HPA: reliability).

What am I looking at on my slide?
Clear cytoplasmic stain in colon or appendix glandular cells, or caudate neurons.	This matches the reported compartment and cells (HPA: general cytoplasmic expression; High in these cells). Score the cell population and compartment, since HPA also reports low or undetected staining in other populations (HPA: tissue IHC).
Predominantly nuclear stain, with little cytoplasmic signal in otherwise positive cells.	A nuclear-only result conflicts with the reported cytoplasmic pattern (UniProt Q9NYS0: Cytoplasm; HPA: general cytoplasmic expression). Treat it as unresolved staining, then check controls and detection conditions before assigning NKIRAS1 localisation (general IHC practice).
Strong stain in cells reported as undetected, such as adipocytes or ovarian stroma cells.	That result warrants a specificity check; cross-reactivity or endogenous detection activity may contribute (general IHC practice; HPA: Not detected in these cells). These are cell-level reference observations, not proof that every cell in those tissues must be negative (HPA: tissue IHC).
Diffuse color across cells and empty spaces, with poor separation of cytoplasm from background.	The pattern cannot establish cytoplasmic NKIRAS1 staining (UniProt Q9NYS0: Cytoplasm; general IHC practice). Inspect the no-primary control and background before scoring intensity; diffuse color alone does not identify the stained cell population (general IHC practice).
No visible signal in colon or appendix glandular cells used as a positive reference.	This misses populations reported as High by HPA (HPA: colon and appendix glandular cells). Check that the relevant cells are present, then assess retrieval, primary incubation and detection with suitable controls (general IHC practice). HPA reports medium staining–RNA consistency, so one section is not definitive (HPA: reliability).

💡Expected NKIRAS1 appearanceA convincing positive is discernible cytoplasmic stain in the relevant glandular or neuronal cells, potentially High in the listed HPA populations; nuclear-only or cell-free diffuse color is suspect (HPA: tissue IHC; UniProt Q9NYS0: Cytoplasm; general IHC practice).

How each factor affects the staining
Which compartment should guide IHC scoring?	Use cytoplasmic staining as the main criterion (UniProt Q9NYS0: Cytoplasm; HPA: general cytoplasmic expression). HPA also describes High Purkinje-cell staining as cytoplasm/membrane; do not generalize that observation to every tissue (HPA: cerebellum).
How should tissue choice affect the reference comparison?	Colon and appendix glandular cells provide reported High examples; adipocytes and skeletal myocytes are reported Not detected (HPA: tissue IHC). Compare the named cells, since the HPA categories describe cell populations within tissues (HPA: tissue IHC).
What does the antibody-validation label support?	The listed antibody HPA077387 is Approved for IHC, while the overall tissue result has medium staining–RNA consistency (HPA: antibody validation; reliability). This supports a reference pattern, but does not establish that every unexpected signal is NKIRAS1 (general IHC practice).
Does the protein record suggest a membrane or shed-protein pattern?	NKIRAS1 has no transmembrane segment, signal peptide or propeptide, and its annotated chain spans residues 1–192 (UniProt Q9NYS0: topology; processing). These annotations support a primarily cytoplasmic expectation; they do not identify the antibody epitope (UniProt Q9NYS0; general IHC practice).
IF/ICC: what localisation is reported?	HPA reports supported cytosol localisation and uncertain endoplasmic-reticulum localisation in ICC-IF; the listed antibody is Supported for ICC (HPA: subcellular; antibody validation). Use that as an IF comparison, without treating the uncertain ER signal as a required IHC feature.

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
Colon or appendix glandular cells are unstained.	The expected High cell population may be absent from the section, or the IHC detection workflow may have failed (HPA: tissue IHC; general IHC practice).	Confirm glandular cells are present; review retrieval, primary-antibody and detection steps, and examine a suitable positive control (general IHC practice).
Nuclei dominate the stain in a reported positive cell population.	Nuclear-only staining conflicts with the reported cytoplasmic location (UniProt Q9NYS0: Cytoplasm; HPA: general cytoplasmic expression).	Compare with a no-primary control, inspect cytoplasmic signal separately, and avoid scoring nuclear color as a positive NKIRAS1 pattern (general IHC practice).
Adipocytes or skeletal myocytes stain strongly.	Those named cell populations are reported Not detected; an off-target or detection-system signal is possible (HPA: tissue IHC; general IHC practice).	Verify cell identity and examine no-primary and other appropriate specificity controls before interpreting the stain (general IHC practice).
Color covers tissue and empty spaces evenly.	Diffuse background obscures the cell-level cytoplasmic pattern needed for interpretation (HPA: general cytoplasmic expression; general IHC practice).	Check background controls, blocking, washes and detection development; rescore only where cell borders and cytoplasm remain interpretable (general IHC practice).
A section called negative contains a few stained cells.	HPA's Not detected labels apply to specified cell populations; UniProt describes NKIRAS1 as widely expressed (HPA: tissue IHC; UniProt Q9NYS0: tissue specificity).	Identify the stained cells and compare them with the matching HPA cell category before calling the tissue result discordant (HPA: tissue IHC; general IHC practice).
Only a membrane-like edge is visible in Purkinje cells.	HPA describes High Purkinje-cell staining as cytoplasm/membrane, while its overall tissue profile is cytoplasmic (HPA: cerebellum; tissue profile).	Look for accompanying cytoplasmic signal and compare controls; do not extend the Purkinje-cell observation to other cell types (HPA: tissue IHC; general IHC practice).

Source: UniProt Q9NYS0 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing NKIRAS1 staining

A11990 · IHCImmunohistochemistry of KappaB ras in human lymph node tissue with KappaB ras antibody at 1 μg/mL.

A11990-1 · IFImmunocytochemistry of KappaB-ras1 in RAW264.7 cells with KappaB-ras1 antibody at 1 μg/mL.

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000197885-NKIRAS1/tissue/cerebral+cortex#imid_20978319

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000197885-NKIRAS1/tissue/colon#imid_20978253

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000197885-NKIRAS1/tissue/liver#imid_20978246

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000197885-NKIRAS1/tissue/kidney#imid_20978247

HPA ICC-IF BJ [Human fibroblast] — NKIRAS1 (HPA077387)

HPA · ICC-IF BJ [Human fibroblast]Human Protein Atlas immunofluorescence, BJ [Human fibroblast], antibody HPA077387; green = NKIRAS1, blue = nucleus, red = microtubules.

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Real IHC / IF data behind the staining-pattern expectations in this section.

Sample controls for NKIRAS1 IHC & IF

🧪Run colon first: glandular cells should stain (HPA: Colon glandular cells, High). Use skeletal muscle myocytes as a negative tissue reference (HPA: Skeletal muscle myocytes, Not detected); the supplied colon row does not identify a confirmed internal negative cell type, so assess staining in neighboring nonglandular cells as background only after identifying them (HPA: Colon glandular cells, High).

Positive control tissue: Appendix (Glandular cells, HPA High)

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show NKIRAS1 in BJ [Human fibroblast], SH-SY5Y, U2OS, with annotated localisation: Endoplasmic reticulum (uncertain), Cytosol (supported) (HPA subcellular).

Technical controls: Include no-primary/secondary-only and host-species- and clonality-matched isotype controls, plus NKIRAS1 knockout tissue or a validated peptide-block control if available (standard IHC practice). For chromogenic detection, quench endogenous peroxidase and check background in the colon section (standard IHC practice).

⚠️Feasibility: A target-specific fixation window or fixation effect is unreported, and the A11990 tissue-IHC caption does not state a fixative (selected tissue-IHC caption). Retrieval dependence is also unreported; optimize antigen retrieval on matched paraffin sections (standard IHC practice). The supplied evidence does not establish that frozen sections or IF are easier, or identify a colon-specific artefact (HPA: Colon glandular cells, High; HPA: NKIRAS1 subcellular ICC-IF images).

HPA tissue IHC evidence for NKIRAS1

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Approved — Medium consistency between antibody staining and RNA expression data.). Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.

Positive expression · recommended positive controls

Tissue	Cell type	Level	Evidence	Source
Appendix	Glandular cells	High	Protein (IHC)	HPA →
Caudate	Neuronal cells	High	Protein (IHC)	HPA →
Cerebellum	Purkinje cells - cytoplasm/membrane	High	Protein (IHC)	HPA →
Cerebral cortex	Neuronal cells	High	Protein (IHC)	HPA →
Colon	Glandular cells	High	Protein (IHC)	HPA →

Undetected expression · recommended negative controls

Tissue	Cell type	Level	Evidence	Source
Adipose tissue	Adipocytes	Not detected	Protein (IHC)	HPA →
Liver	Cholangiocytes	Not detected	Protein (IHC)	HPA →
Ovary	Ovarian stroma cells	Not detected	Protein (IHC)	HPA →
Skeletal muscle	Myocytes	Not detected	Protein (IHC)	HPA →
Spleen	Cells in red pulp	Not detected	Protein (IHC)	HPA →

Section 3

Advanced NKIRAS1 IHC Tips

Troubleshoot NKIRAS1 staining by checking retrieval, cellular compartment and cell type before comparing chromogenic signal across paraffin sections.

What should I change if NKIRAS1 staining is weak after retrieval?

Start with citrate pH 6.0 heat-induced antigen retrieval at 95–98 °C for 20 min (page retrieval rule: cytoplasmic / membrane antigen). Check that sections remain covered by buffer, then compare retrieved and untreated sections using the same antibody and chromogenic development conditions (standard IHC practice). The catalog tissue image used 1 µg/mL antibody in human lymph node, but its caption reports neither fixative nor retrieval method (A11990 tissue-IHC caption). If staining remains weak, optimize retrieval duration in small increments while watching for tissue damage and rising background (standard IHC practice). Score cytoplasmic signal in identifiable cells rather than treating diffuse color across the section as recovery (UniProt Q9NYS0: cytoplasm; standard IHC practice).

Could fixation explain weak or uneven NKIRAS1 IHC staining?

NKIRAS1-specific fixation sensitivity is unknown from the supplied evidence; the catalog lymph-node image does not state its fixative (A11990 tissue-IHC caption). Record the fixative, fixation duration, section age and retrieval conditions for each specimen before comparing staining intensity (standard IHC practice). If material permits, stain sections with different documented fixation histories in the same run, using identical retrieval, antibody concentration and development time (standard IHC practice). Evaluate morphology alongside signal, because damaged or poorly preserved areas can make chromogenic staining difficult to interpret (standard IHC practice). Neither the reported tissue staining pattern nor the protein's topology establishes a preferred fixation duration (HPA tissue IHC; UniProt Q9NYS0 topology).

Should NKIRAS1 stain cytoplasm, membranes or nuclei in tissue sections?

Prioritize cytoplasmic staining when evaluating NKIRAS1: UniProt assigns it to the cytoplasm, and the tissue IHC profile describes general cytoplasmic expression (UniProt Q9NYS0: cytoplasm; HPA tissue IHC). Cell-based imaging supports a cytosolic location, while its endoplasmic-reticulum assignment is uncertain (HPA subcellular: cytosol supported; endoplasmic reticulum uncertain). A strong nuclear-only pattern therefore warrants checks of antibody specificity, counterstain separation and chromogen development before interpretation (UniProt Q9NYS0: cytoplasm; standard IHC practice). NKIRAS1 has no annotated transmembrane segment, so a sharply outlined surface pattern should be reviewed against cell morphology and controls (UniProt Q9NYS0 topology; standard IHC practice). Compare staining within the same cell population across sections, since tissue-level expression is broad but cell-level intensity varies (UniProt Q9NYS0: widely expressed; HPA tissue IHC).

How do I assess an unexpected NKIRAS1 staining pattern without an epitope map?

The supplied record describes one 192-aa chain and lists no annotated isoforms, glycosylation sites or modified residues (UniProt Q9NYS0 processing, isoforms and PTMs). Those annotations do not identify this antibody's epitope or establish that every fixation and retrieval condition exposes it equally (UniProt Q9NYS0 record; standard IHC practice). Keep retrieval, antibody concentration and detection conditions matched while comparing an expected cytoplasmic pattern with negative controls (UniProt Q9NYS0: cytoplasm; standard IHC practice). If staining remains discordant, use an independently validated reagent or an appropriate loss-of-target control where available, and document the reagent's epitope information if supplied (standard IHC practice). Avoid assigning distinct staining compartments to isoforms without direct supporting evidence (UniProt Q9NYS0: no annotated isoforms).

How can IF help resolve ambiguous NKIRAS1 staining seen by chromogenic IHC?

Use IF as a separate validation experiment and multiplex NKIRAS1 with a marker that identifies the expected cell population, such as glandular cells in appendix or colon (HPA tissue IHC: high in glandular cells). Choose a far-red fluorophore when shorter-wavelength tissue autofluorescence obscures signal, and include single-color and no-primary controls (standard IF practice). Permeabilize sufficiently to give antibody access to a cytosolic epitope, then titrate detergent to preserve cellular structure (HPA subcellular: cytosol supported; standard IF practice). Compare cytoplasmic overlap within marker-positive cells and inspect each channel separately before attributing puncta to NKIRAS1 (UniProt Q9NYS0: cytoplasm; standard IF practice). The catalog lymph-node IHC caption supplies no IF fixation or permeabilization conditions (A11990 tissue-IHC caption).

How should I troubleshoot diffuse brown background in NKIRAS1 sections?

Run a no-primary control and inspect whether brown signal persists after the usual peroxidase block and DAB development (standard chromogenic IHC practice). Compare that control with an antibody-stained section processed for the same retrieval and development times, since excess development can obscure cytoplasmic boundaries (standard IHC practice). Titrate the antibody around the catalog image's 1 µg/mL condition while holding other steps constant; that concentration describes the pictured lymph-node experiment, not every tissue (A11990 tissue-IHC caption; standard IHC practice). HPA reports no detection in adipocytes and skeletal-muscle myocytes, but these observations are comparison points rather than universal negative controls (HPA tissue IHC). Interpret signal by cell type and morphology before changing blocking or detection reagents (standard IHC practice).

What is a defensible way to quantify NKIRAS1 chromogenic staining? ⚠ ANSWER MARKED FOR VERIFICATION

Define the cell population before scoring, because HPA reports high staining in several glandular-cell populations and no detection in some other populations (HPA tissue IHC). For identifiable cells, record the percentage at each intensity grade and calculate an H-score from those percentages, or report the percentage positive using a prespecified threshold (standard IHC quantification practice). Normalize counts to the number of viable cells in that same annotated population; for area-based counts, report positive cells per mm² of evaluable tissue (standard IHC quantification practice). Keep section thickness, retrieval, antibody concentration, imaging settings and DAB development comparable across batches (standard IHC practice). Exclude folds, edges and necrotic regions using the same written rule for every section (standard IHC quantification practice).

When is an apparent NKIRAS1-positive cell likely an artefact?

A convincing result places signal predominantly in the cytoplasm of morphologically intact cells, consistent with the reported tissue and protein localization (HPA tissue IHC; UniProt Q9NYS0: cytoplasm). Question nuclear-only staining, edge-restricted color, necrotic deposits or diffuse staining that also appears in the no-primary control (UniProt Q9NYS0: cytoplasm; standard IHC practice). Check peroxidase blocking and compare DAB development before calling persistent brown deposits target expression (standard chromogenic IHC practice). Interpret the actual cell type: HPA reports high signal in appendix glandular cells but no detection in liver cholangiocytes, so whole-tissue labels are insufficient (HPA tissue IHC). HPA rates its tissue staining approved with medium RNA agreement, which supports cautious comparison rather than treating any single section as definitive (HPA tissue IHC reliability).

Boster reagents

Best NKIRAS1 / NF-kappa-B inhibitor-interacting Ras-like protein 1 IHC Antibodies

Anti-NKIRAS1 antibodies have IHC data from human lymph node tissue (A11990 image caption) and ICC data from RAW264.7 cells (A11990-1 image caption).

Real IHC data Immunohistochemistry of KappaB ras in human lymph node tissue with KappaB ras antibody at 1 μg/mL.

Anti-KappaB ras NKIRAS1 Antibody

Cat # A11990

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Real IF data Immunocytochemistry of KappaB-ras1 in RAW264.7 cells with KappaB-ras1 antibody at 1 μg/mL.

Anti-KappaB ras1 NKIRAS1 Antibody

Cat # A11990-1

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A11990 renders with a human lymph node IHC image at 1 μg/mL (A11990 image caption). A11990-1 renders with a RAW264.7 cell ICC image at 1 μg/mL (A11990-1 image caption).

Which to pick: Choose A11990 for paraffin-section IHC (catalog: IHC-P); its human lymph node image documents tissue IHC, but the fixative is unreported (A11990 image caption). Choose A11990-1 for ICC/IF of cells (catalog: ICC; A11990-1 image caption), and A11990 for the broader listed species reactivity of human, mouse and rat (catalog: A11990 reactivity); IHC image evidence is from human tissue only (A11990 image caption). Clonality is unreported for both antibodies (catalog: clone fields).

Each figure is that product's own IHC / IF validation image from its datasheet.

References

UniProt Consortium. UniProt entry Q9NYS0 (KBRS1_HUMAN, NF-kappa-B inhibitor-interacting Ras-like protein 1).
Human Protein Atlas. NKIRAS1 tissue IHC expression (reliability: Approved).
Human Protein Atlas. NKIRAS1 subcellular location (ICC-IF): Localized to the endoplasmic reticulum and cytosol..
Human Protein Atlas. NKIRAS1 antibody validation summary (1 antibodies).
A glomerular transcriptomic landscape of apolipoprotein L1 in Black patients with focal segmental glomerulosclerosis. Kidney international 2022 — PMC9206042.
PubMed PMID:10657303 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:15489334 — UniProt-cited evidence.